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When the steady hum of your AC system is interspersed with other unfamiliar noises, it's often a good idea to investigate the problem. Unusual sounds originating from compressor may signify mechanical problems, and need to be examined by a professional HVAC technician as soon as possible. Here are a few problematic noises, and what they mean:

Clanking: This type of noise is often the result of a loose component, for instance, a piston pin or connecting rod. Unfortunately, the only option usually available is to replace the compressor.

Rattling: Internal mounts can cause rattling noises and originate from the compressor. Usually this means that the motor is loose and requires steadying.

Clicking: Faulty electronics are usually the cause of these types of sounds, for instance, controls and relays.

Screaming or loud hissing: This may be the result of dangerous pressure built up within the unit. If you encounter such this type noise, its best to shut the system down until a trained HVAC technician has dealt with the problem

Humming: If you have trouble starting your compressor, this could indicate low oil levels.

Remember, that apart from these unwelcome sounds, you may hear liquid flowing from inside the AC unit. This is entirely normal, however, should you hear bubbling or hissing noises, there could be more serious problem - refrigerant leaks, which will require a technician for proper calibration.
If you've experienced A/C noises lately, we hope this guideline helps to diagnose the problem. If you'd like any advice on maintaining or repairing your A/C system,or even an owners manual, we'd be delighted to hear from you. Contact us today.
As the trusted name in HVAC services and supplies in the South Bay Peninsula and Santa Cruz areas since 1962, we take pride in keeping your home comfortable through all seasons, also specializing in fireplaces, solar technology and electrical services.
Our goal is to help educate our customers in the South Bay Peninsula and Santa Cruz areas of California about energy and home comfort issues (specific to HVAC systems). For more information about noisy A/C units and other HVAC topics, download our free Home Comfort Resource guide.Image courtesy of Shutterstock